A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geotechnical and Earth Resources Engineering, School of Engineering and Technology

Thesis (M.Eng.) - Asian Institute of Technology, 2017

Liquefaction is one cause of damages to structures in the 2014 Chiang Rai earthquake in Thailand, the liquefaction occurred scatteredly in the Quaternary sediment area in Mae Lao district where there were some damages to shallow foundation. The purpose of this study is to do liquefaction assessment in Mae Lao district area. Basic soil properties of subsoils are obtained from 15 boreholes. The liquefaction susceptibility analysis shows that the soils are susceptible to liquefaction. Furthermore, a prediction of severity of liquefaction was assessed based on the characteristic of Phayao fault. The level of severity of liquefaction is judged using the liquefaction potential index (LPI). The result shows that the level of severity and area affected by liquefaction increases with an increase in size of earthquake. In addition, a liquefaction probabilistic assessment is made considering fluctuation of ground water level and potential earthquakes from all active faults in proximity of Mae Lao district. The assessment indicates that shallow footings with size larger more than 1 m will be safe from liquefaction. Finally, maps of annual probability of liquefaction and failure of shallow footing of Mae Lao district were produced.